/*
 * Copyright (c) 2004,2013, KNOPFLERFISH project
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following
 * conditions are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials
 *   provided with the distribution.
 *
 * - Neither the name of the KNOPFLERFISH project nor the names of its
 *   contributors may be used to endorse or promote products derived
 *   from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.knopflerfish.bundle.serial;

import java.util.Dictionary;
import java.util.Enumeration;
import java.util.Hashtable;

import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceRegistration;
import org.osgi.service.cm.ManagedServiceFactory;

import org.knopflerfish.service.log.LogRef;

class Config
  implements ManagedServiceFactory
{
  private final static String msfPid = "org.knopflerfish.serialport.factory";

  private final static String PID = "service.pid";

  private BundleContext bc;
  private final LogRef log;

  private ServiceRegistration<ManagedServiceFactory> sreg;
  private boolean dying;
  private Dictionary<String, SPD> spds = new Hashtable<String, SPD>();

  Config(LogRef log)
  {
    this.log = log;
  }

  void start(BundleContext bc)
  {
    this.bc = bc;

    final Dictionary<String, String> props = new Hashtable<String, String>();
    props.put(PID, msfPid);

    if (dying) {
      return;
    }
    sreg = bc.registerService(ManagedServiceFactory.class, this, props);
    synchronized (this) {
      if (!dying) {
        return;
      }
    }
    stop();
  }

  void stop()
  {
    synchronized (this) {
      if (sreg == null) {
        dying = true;
        return;
      }
    }
    sreg.unregister();
    synchronized (this) {
      for (final Enumeration<SPD> e = spds.elements(); e.hasMoreElements();) {
        final SPD s = e.nextElement();
        s.close();
      }
      spds = null;
    }
  }

  public synchronized void updated(String pid, Dictionary<String, ?> conf)
  {
    final String port = (String) conf.get("port");
    final String product = (String) conf.get("product");
    final String revision = (String) conf.get("revision");

    if (log.doDebug()) {
      log.debug("Confiured port=" + port + ", product=" + product
                + ", revision=" + revision);
    }

    deleted(pid);
    if (port != null && product != null) {
      final SPD spd = new SPD();
      try {
        spds.put(pid, spd);
        spd.start(bc, port, product, revision);
      } catch (final Exception e) {
        if (log.doError()) {
          log.error("Failure starting serial port device", e);
        }
        spds.remove(pid);
      }
    }
  }

  public synchronized void deleted(String pid)
  {
    final SPD spd = spds.remove(pid);
    if (spd != null) {
      spd.close();
    }
  }

  public String getName()
  {
    return "Serial port";
  }
}
